Article
Chemistry, Physical
Renjie Jiang, Geman Shi, Chengmao Huang, Weiguang Zheng, Shande Li
Summary: This paper proposes a novel membrane-type acoustic metamaterial (MAM) with asymmetric rings, achieving improved broadband sound isolation performance while maintaining lightweight. The influence of different mass blocks on the membrane is analyzed, demonstrating the superior performance of this MAM compared to traditional MAMs. Furthermore, the tunability of the sound insulation performance of this MAM is proven by discussing the influence of eccentricity and distribution position of the masses. Finally, the MAM is optimized using the Isight platform, resulting in improved average sound transmission loss, bandwidth above 30 dB, and reduced mass density.
Article
Acoustics
Zhe Zhang, Xinying Wang, Zhong Yuan Liu, Qiang Fan, Tian Ran Lin
Summary: This paper presents a new design of a perforated plate-type acoustic metamaterial (PAM) that can achieve designated sound insulation while allowing air ventilation and avoiding the influence of membrane pre-tension. The study analyzes the sound insulation mechanism of a typical perforated membrane-type acoustic metamaterial and confirms that the sound transmission loss peaks are due to strong wave interference. An impedance analysis using an electro-acoustic analogy further explores the sound insulation mechanism and validates the strong sound interference as the cause of the peaks. Experimental tests and finite element simulations show that the new perforated PAM design can provide good broadband sound transmission loss at low frequencies, and a practical application in reducing noise propagation from a commercial refrigerator's compressor compartment demonstrates the effectiveness of the design in terms of sound reduction and air ventilation.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Chemistry, Physical
Junyu Li, Yuanyuan Shi, Renjie Jiang, Zhifu Zhang, Qibai Huang
Summary: A fast prediction method for the sound transmission loss (STL) of membrane-type acoustic metamaterials (MAMs) is proposed in this paper. Through numerical simulations, the accuracy of the method is validated and the influence of mass surface density change on STL is investigated.
Article
Polymer Science
Heyuan Huang, Ertai Cao, Meiying Zhao, Sagr Alamri, Bing Li
Summary: The study introduces the design concept of bionic configuration philosophy into membrane-type acoustic metamaterials to achieve wide sound-attenuation bands in the low frequency range. Two bio-inspired designs show significant sound attenuation with lightweight performance in comparison to traditional MAM configurations.
Article
Mechanics
Yu-Zhou Wang, Li Ma
Summary: This paper proposes a new structure that combines the pyramidal truss core sandwich structure with membrane-type metamaterials, showing good mechanical properties and excellent acoustic performance at low frequency. An analytical model and finite element method are employed to investigate the sound transmission loss (STL) performance, discussing the effects of various factors on the STL of the structure.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Moris Kalderon, Antonios Mantakas, Andreas Paradeisiotis, Ioannis Antoniadis, Evangelos J. Sapountzakis
Summary: This paper proposes a simple dynamic directional amplification (DDA) mechanism to artificially increase the inertia of locally resonant metamaterials (LRMs). The results show that the improved metamaterial structure has broader bandgaps and significant improvements, and can be applied to seismic wave mitigation.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Acoustics
D. R. Amaral, M. N. Ichchou, P. Kolakowski, P. Fossat, M. Salvia
Summary: Reducing the mass of automotive components improves performance and driving range, but lightweight construction often leads to noise and vibration issues. This study focuses on lightweighting gearbox housings and introducing vibroacoustic metamaterials to enhance their Noise, Vibration, and Harshness (NVH) characteristics. Topology optimization methods were used to reduce the mass of the gearbox housings, and their noise emission was numerically evaluated. Locally resonant metamaterial solutions were applied and tested in numerical simulations, showing reduced noise emission in predicted band gaps and significant attenuation across the entire frequency spectrum. Experimental results confirmed the effectiveness of the proposed solutions. Vibration was also attenuated, including in parts where the metamaterials were not applied. The lightweight, passive, and low-cost nature of the proposed solutions make them suitable for enhancing NVH characteristics in housings.
Article
Engineering, Mechanical
Jun -Young Jang, Kyungjun Song
Summary: This study developed a synergetic soundproofing acoustic metamaterial (SSAM) that can simultaneously block low-frequency and broadband noise by utilizing a membrane and locally resonant structure (LRS). The soundproofing mechanism and performance of the SSAM were clarified and validated through impedance models and simulations. The experimental results show that SSAMs can provide excellent low-frequency and broadband sound insulation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Xiao-Ling Gai, Xi-Wen Guan, Ze-Nong Cai, Xian-Hui Li, Wen-Cheng Hu, Tuo Xing, Fang Wang
Summary: This paper proposes a honeycomb-like sandwich acoustic metamaterial that can effectively control low-frequency noise. By establishing finite element models and analyzing the effects of different parameters, the role of Helmholtz resonators in transmission loss is studied. Experimental results confirm the excellent sound insulation performance of this acoustic metamaterial.
Article
Engineering, Mechanical
D. Roca, J. Cante, O. Lloberas-Valls, T. Pamies, J. Oliver
Summary: MLAM is a novel concept of acoustic metamaterials based on coupled resonance mechanisms, providing enhanced sound attenuation capabilities suitable for large scale manufacturing.
EXTREME MECHANICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Sidharth Beniwal, C. Chandraprakash
Summary: In this study, a scalable and quick fabrication method for metal-ceramic locally resonant phononic crystals (LRPCs) and their acoustic characteristics were reported. Experimental and computational results confirmed the presence of zero group speeds and bandgaps at lower frequencies in the LRPCs. The study demonstrated the feasibility of using simple traditional fabrication methods to achieve ceramic LRPCs.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Acoustics
Yumei Zhang, Ye Li, Yue Zhao, Dan Yao, Yi Ai, Weijun Pan
Summary: A theoretical model of normal sound insulation of rectangular locally resonant plates is established in this study. The accuracy of the model is verified through comparison with simulation results. The lightweight sound insulation of the plates is optimized using a non-dominated genetic algorithm. The results show that the resonators can improve the local frequency band sound insulation, but cannot surpass the insulation provided by the equal-mass bare plate. This study provides important insights for the evaluation and design of low-frequency sound insulation for transportation equipment plates.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Chemistry, Multidisciplinary
Juan Mo, Zongren Peng, Xu Wang
Summary: This paper presents theoretical and numerical studies on the vibrating mechanisms of acoustic micromembranes (A mu Ms) and demonstrates their unique behavior in terms of sound insulation. The results provide a theoretical foundation for designing large-scale, high-insulation assemblies of A mu Ms.
APPLIED SCIENCES-BASEL
(2022)
Article
Acoustics
Vanessa Cool, Lucas Van Belle, Claus Claeys, Wim Desmet, Elke Deckers
Summary: This work investigates the impact of the ignored acoustic transmission path on the sound transmission loss of sandwich panels with structural periodic cores exhibiting bandgap behavior. It highlights the importance of considering both the structural and acoustic paths during the design phase to accurately predict the vibro-acoustic performance of these novel sandwich panel configurations.
Article
Acoustics
Xingyun Li, Junjuan Zhao, Wenjiang Wang, Tuo Xing, Liying Zhu, Yunan Liu, Xianhui Li
Summary: This paper presents a membrane-type acoustic metamaterials array with compact magnets (MAMMs array) for acoustic insulation, consisting of four cells. Experimental and modeling results demonstrate the tunable sound insulation characteristics of the array in different cells.